HER2

HER2 (Human Epidermal Growth Factor Receptor 2) is a protein found on the surface of some cells, including certain breast cancer cells. It helps regulate cell growth and division. In some cancers, the HER2 gene is amplified or overactive, leading to excess HER2 protein, which causes cells to grow and multiply uncontrollably. This makes HER2-positive cancers more aggressive. Testing for HER2 helps doctors determine the best treatment options. Targeted therapies can specifically attack HER2-positive cancer cells, improving outcomes for patients with this type of breast cancer.